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Today's question.........
Posted: Thu Nov 12, 2015 8:59 pm
by Niner Delta
This is something I didn't know until recently looking at a conversion chart.
And the question is.........
Why are they referred to as 7.62x54r and 7.62x39 when they both have a bullet
diameter of 7.92 (.311) ???
Anyone ?????
Re: Today's question.........
Posted: Fri Nov 13, 2015 12:16 am
by deadin
Land diameter vs. groove diameter. Think .303 British (actually .311)
Re: Today's question.........
Posted: Fri Nov 13, 2015 7:10 pm
by Niner Delta
Thanks deadin.
I guess I was wrong in thinking that it was the diameter of the bullet that determined what
size the round was called, and not the lands and grooves of the barrel.
Live and learn........... 
Re: Today's question.........
Posted: Fri Nov 13, 2015 9:32 pm
by Aughnanure
Down here on the top of the world we have some weird restrictions on licenced pistols (no such restrictions imposed on criminal's guns); there are 'high' and'low' calibres, I can have a .357 Magnum 'cause that's a low calibre and measures under the .38 limit, but I can't have a .38-40 (except in a black powder pistol) 'cause that's a high calibre being a true .401.
I love logic
Re: Today's question.........
Posted: Sat Nov 14, 2015 5:16 pm
by Niner Delta
Government logic = a true oxymoron............ 
Re: Today's question.........
Posted: Fri Jan 08, 2016 5:50 pm
by Karl/Pa.
The Russian 7.62x54r has a rimmed case (r stands for rimmed) much like a .22 BUT also the case is tapered.
